Question about 1996 Chevrolet Monte Carlo

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1996 M.Carlo 3.4 Ltr V-6 erratic idle in park. tap gas and engine rpm races like too much gasflow/or/air leak at intake?

Trying to determine if there is an Idle/control module that regulates gas / air mix. No.2 cylinder dead due to possible damaged valve. Engine does have noticeable miss at low rpm but at higher rpm , it smooths out.

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  • Chevrolet Master
  • 531 Answers

Can be anything you stated from a vac leak is easiest and first to check

any trouble codes stored? free obd 2 scan at local autozone or other car part store

but #2 dead cylinder is definitely a problem; you find out via trouble code scan? dunno if you already had done a tune up to write off the spark plugs

only other way to check that valve problem is a compression tester <shrugs>

good luck to you; you're hunting in the right direction, but no one can give you a definitive answer

Posted on Apr 01, 2015

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Posted on Jan 02, 2017

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3 Answers

COULD THE GAS PEDAL CABLE CAUSE THIS CODED PO507 to be high


Extracted from Engine-Codes.com

Code P0507

Possible causes

- Dirty throttle body

- Electric throttle control actuator misadjusted or damaged

- Faulty Electric throttle control actuator

- Intake air leak

- Poor electrical connection to the Intake Air Control (IAC) valve


help.jpg What does this mean?

Tech notes

If there are no intake leaks, clean throttle body, adjust engine idle and erase engine code. If the code comes back you may have to replaced the Electric Throttle Control Actuator (Motor) to repair the problem.



There is a factory service bulletin for the following Chevrolet models:



2006-2008 Chevrolet Trail Blazer

2007-2008 Chevrolet Avalanche

2007-2008 Chevrolet Express

2007-2008 Chevrolet Silverado

2007-2008 Chevrolet Suburban

2007-2008 Chevrolet Tahoe

Chevrolet Factory Service Bulletin OBDII Code P0507


What does this mean?

When is the code detected?

Thi P0507 code sets when the Powertrain Control Module (PCM) detects an engine speed outside of the Idle Air Control (IAC) valve range of control.

Possible symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

- Engine hard to start

- Rough or erratic idle speed

P0507 Chevrolet Description

The Idle Air Control (IAC) valve is a Powertrain Control Module (PCM) controlled stepper motor located on the throttle body. The stepper motor drives a valve pintle which protrudes into a passage that bypasses the throttle plates. The PCM commands the IAC valve pintle to extend to decrease the idle speed. The bypass air flow is reduced and the idle speed decreases as the pintle approaches its seat. The PCM retracts the IAC valve pintle away from its seat to increase the idle speed. The retracting of the IAC valve pintle allows more air to bypass the throttle plates. One of the PCMs uses for the IAC system is to maintain a desired idle speed. This DTC sets when the PCM detects an engine speed outside of the IAC\'s range of control.





Read more: http://engine-codes.com/p0507_chevrolet.html#ixzz3ObdI2chF

Jan 11, 2015 | 2001 Chevrolet Blazer

1 Answer

I just got my car scanned and a few codes pop up


Error Code: P0130
Fault:
Oxygen Sensor (O2S) 1, Bank 1 - Circuit Malfunction
Possible Cause:
Malfunction Indicator Lamp (MIL) Triggered on first occurrence.
-Wiring harness.
-Oxygen sensor (O2S).
-Engine control module (ECM).

Error Code: P0505
Fault:
Idle Speed Control (ISC) System - Malfunction
Possible Cause:
-Wiring harness.
-Idle speed control (ISC) actuator/Idle air control valve (IAC) valve.
-Throttle motor.
-Throttle valve tight/sticking.
-Engine control module (ECM).

Error Code: P0100
Fault Location:
-Mass Air Flow (MAF) Sensor/Volume Air Flow (VAF) Sensor - Circuit --Malfunction
Possible Cause:
-Wiring harness.
-Mass air flow (MAF) sensor.
-Volume air flow (VAF) sensor.
-Engine control module (ECM).

Error Code: P1491
Fault:
Exhaust Gas Recirculation (EGR) Valve Insufficient Lift
Possible Cause:
-Wiring harness.
-EGR Valve.
-ECM

Error Code:P1607
Fault:
-Engine Control Module (ECM)/Powertrain Control Module (PCM)

Error Code: P0966
Location:
-Pressure Control (PC) Solenoid B - Circuit Low
Possible Cause:
-Wiring short to earth.
-Pressure control (PC) solenoid.
-Engine control module (ECM)/Powertrain control module -(PCM)/Transmission control module (TCM) .


Apr 30, 2013 | 2004 Honda Civic

2 Answers

REPLACED THE EGR VACUUM SOLENOID NOW IDLES RUFF AND RPM GO UP AND DOWN AT IDLE


It can be issue with IAC( idle air control valve) causing the problem.

There are many other possibilities causing these idle issues.Engine idles rough.There are few help links with solutions to troubleshoot such idle issues.
I suggest you refer the link below and follow its troubleshooting details:------Click the link below:-----Bad miss at idle? http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html
-----------
Stumbling and stalling at idle after engine rebuild? http://schematicsdiagram.blogspot.in/2012/03/stumbling-and-stalling-at-idle-after.html

------------
1999 Ford F-150 Idles rough and quits when gas pedal is pressed less? http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html

--------- Engine stumbles coming off idle when warm?

http://repairhelpcenter.blogspot.com/2012/01/engine-stumbles-coming-off-idle-when.html

------------------
Erratic idle on car?

http://schematicsdiagram.blogspot.com/2011/12/erratic-idle-on-car.html

-----------


Cold start problem and vehicle shudder around 2500 to 3500 rpms
http://repairhelpcenter.blogspot.com/2012/10/cold-start-problem-and-vehicle-shudder.html
---------- Low idle when cold out side?

http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html

-----------


GMC Sonoma Stalls and idles low http://technoanswers.blogspot.com/2012/10/gmc-sonoma-stalls-and-idles-low.html
--------


GMC Idle Air Control (IAC) Valve Replacing?

http://schematicsdiagram.blogspot.com/2011/12/gmc-idle-air-control-iac-valve.html

-------------
1996 Camry intermittent engine failure while idle?

http://repairhelpcenter.blogspot.com/2011/10/1996-camry-intermittent-engine-failure.html

------------
Engine quits at idle?

http://repairhelpcenter.blogspot.com/2011/10/engine-quits-at-idle.html

-----------
Car overheats and Air blows hot at idle?

http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html

---------


High Idle Problem
http://repairhelpcenter.blogspot.com/2012/10/high-idle-problem.html
-------


While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

---------
Idle flair is noticed on car? Rough idle? car will not idle? Erratic idle speed?

http://technoanswers.blogspot.in/2012/02/idle-flair-is-noticed-on-car-rough-idle.html

--------
High rpm in neutral? Inconsistant high RPM in neutral?

http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html

-------
Vehicle stumbling at idle and shows code 54?

http://schematicsdiagram.blogspot.in/2012/03/vehicle-stumbling-at-idle-and-shows.html

----------
Rough idle, staling and Erratic shifting? http://technoanswers.blogspot.in/2012/03/rough-idlestaling-and-erratic-shifting.html
-----------While stop engine idles like cylinder missing? http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html
---------These details will help.Thanks.

Nov 23, 2012 | 2001 Ford Escape

2 Answers

Engine dies at stop lights


very open question but its usually the idol control sensor. its attached to a cable usually open in the engine compartment. pulling this cable which goes back into the firewall will rev the engine. once you find the cable, find the bolt that attaches to the cable and tighten the cable, this will ajust at what RPM the car idols at and keep it from stalling when you let off the gas.

Mar 07, 2011 | Saturn SC2 Cars & Trucks

1 Answer

The car has no horse power, the check engine light is on and there is no problems with the computer board or co sensor


Hello, here are three of the most common causes for loss of horse power.

1. Idle air control valve. ( sometimes they can be removed and cleaned )
2. MAF, ( mass air flow ), sensor. ( sometimes they can be removed and cleaned )
3. O2, ( oxygen sensor ). ( needs to be replaced )

All three of these things are part of your emission system, and all three of these things, if faulty or dirty can prevent the EMC, ( electronic control module ), from determining the proper fuel/air mix ratio. The ratio should be 1 part fuel to 14.7 parts air. A bad fuel/air mix can cause the following.
a. Bad idle.
b. Loss of power/poor acceleration.
c. stalling/fake stalling.
d. Poor gas mileage.
e. Prevent engine from starting.

I hope this helps you.
Donnie

Mar 01, 2011 | 2000 Hyundai Accent

2 Answers

My monte carlo has code p0507 what is it and how can i fix it


possible causes
- Dirty throttle body
- Electric throttle control actuator misadjusted or damaged
- Faulty Electric throttle control actuator
- Intake air leak
- Poor electrical connection to the Intake Air Control (IAC) valve
solution !!!
If there are no intake leaks, clean throttle body, adjust engine idle and erase engine code. If the code comes back you may have to replaced the Electric Throttle Control Actuator (Motor) to repair the problem.

Jan 28, 2011 | 2000 Chevrolet Monte Carlo

1 Answer

I have changed everything: Spark plugs, Wires, Coil Packs, Ignition Control Module, Air Idle Control Valve, Throttle Position Sensor, Map Sensor, Cleaned out my PCV valve. My EGR Valve is in great shape so...


There are three components that will enrich the fuel mix: 1)engine coolant temperature sensor. If this is not working or the signal is interrupted by a wire breakage then the engine will run rich. The coolant sensor informs the ECU (high resistance) that the engine is cold at start up and so the ECU responds by increasing the fuel injection cycle to enrich the fuel air mix. Later on as the engine warms the resistance of the coolant sensor drops and the injection cycle is reduced by the ECU. If the sensor is faulty or has become disconnected (wire break or corrosion of the socket pins) the ECU assumes that the engine remains 'cold' and the engine runs permanently rich. 2) O2 sensor, operates completely independently of the EGR, if it is faulty and signals 'too much oxygen' then the ECU will significantly enrich the fuel mix to try and balance what it thinks is an excess of air. 3) Fuel pressure regulator. If the diaphragm has broken or there is a leak in the vacuum line this will result in higher than needed fuel pressure in the fuel rail at idle. The vacuum line acts against the spring pressure holding the valve closed. At idle, the inlet vacuum pulls back on the diaphragm reducing the fuel pressure required to open the valve. Low fuel pressure coupled with short duration injection times will mean a lean mix at idle. If the vacuum is compromised or the diaphragm damaged then the increase in rail pressure will make the fuel mix very rich to point of flooding the engine

Nov 02, 2010 | 1993 Isuzu Trooper

1 Answer

2005 F150 5.4 Cuts off when driving at constant speed and show "Engine Fail Safe Mode" on display. It will crank back up and run for several hundred miles before doing it again. P2112 Throttle Air...


unfortunately no ! Your best bet take it to the dealer . The P0420 always ends up being the catalytic converter ! P2104 isn't throttle air control . P2112 - Throttle Actuator Control (TAC) System - Stuck Closed. Description: This powertrain control module (PCM) fault status indicates the throttle plate is at a lower angle than commanded. Possible Causes:
  • Binding throttle body, stuck closed.
  • Damaged PCM.
Diagnostic Aids: Application Key On Engine Off Key On Engine Running Continuous Memory All GO to DV1
P2104 - Throttle Actuator Control (TAC) System - Forced Idle Description: The TAC system is in the failure mode effects management (FMEM) mode of forced idle. Possible Causes:
  • Open or short in multiple accelerator pedal position (APP) sensor circuits.
  • Damaged APP sensor.
  • Damaged powertrain control module (PCM).
Diagnostic Aids: This DTC is an informational DTC and can be set in combination with a number of other DTCs which are causing the FMEM. Diagnose other DTCs first. Application Key On Engine Off Key On Engine Running Continuous Memory All GO to QE1
P0506 - Idle Air Control (IAC) System RPM Lower Than Expected For Vehicles With Electronic Throttle Control (ETC) Description: This DTC is set when the powertrain control module (PCM) detects an engine idle speed that is less than the desired RPM. Possible Causes:
  • Air intake restriction.
  • Exhaust restriction.
  • Engine mechanical fault.
  • Damaged electronic throttle body (ETB).
  • Damaged PCM.
Diagnostic Aids: This DTC is informational only and it may be accompanied by other DTCs. Diagnose other DTCs first. If other DTCs are not present inspect the intake air system for air restrictions and damage. If no concerns are present, clear the DTC and retest. For All Others Description: This DTC is set when the powertrain control module (PCM) detects an engine idle speed that is less than the desired RPM. Possible Causes:
  • IAC circuit open.
  • Air inlet is plugged.
  • B+ or VPWR to IAC solenoid open.
  • Damaged or incorrect IAC valve.
  • IAC valve stuck closed.
  • VPWR to IAC solenoid open.
  • IAC circuit shorted to PWR.
Diagnostic Aids: Disconnect the IAC valve and look for little or no change in engine RPM as an indication of a stuck or damaged valve. Application Key On Engine Off Key On Engine Running Continuous Memory Vehicles With Electronic Throttle Control (ETC) Refer to the Description, Possible Causes and Diagnostic Aids for the DTC. All others GO to KE1

Jul 03, 2017 | 2005 Ford F-150

1 Answer

OP400 Engine ligh code?


P0400 - Exhaust Gas Recirculation Flow Malfunction

The exhaust gas recirculation (EGR) valve is vacuum controlled valve that regulates the amount of exhaust gases that re-enter the cylinders. The powertrain control module (PCM) determines how much based on engine load, temp, and other conditions. If the PCM detects that the amount of exhaust gases entering the cylinder were insufficient or non-existent, this code is set.
Symptoms:
FB.init("dd7d9e9681341cde77587bc6a2029f6f"); OBD-Codes.com on Facebook No symptoms will likely be noticed by the driver other than the MIL (malfunction indicator lamp). However, non visible symptoms will be increased combustion temperature and increased Nox emissions.

Causes: A code P0400 may mean that one or more of the following has happened:
  • Plugged EGR passage which restricts the flow of exhaust gasses
  • Faulty EGR solenoid
  • Faulty EGR solenoid wiring/harness
  • Vacuum lines damaged/disconnected to the EGR valve solenoid or to the EGR valve
  • Faulty EGR valve

Possible Solutions: Since EGR valve designs are different, no one test will suffice:
  • Using a scan tool, operate the EGR valve with the engine running. If the engine stumbles, the problem was likely intermittent wiring problem or intermittent blockage problem
  • If engine doesn't stumble, operate the EGR valve manually, if possible. If engine doesn't stumble and die, the ports are likely plugged. Removal of valve and cleaning of all ports will be required
  • Checking of solenoid can only usually be done with a scan tool, because most solenoids operate with a duty cycle of voltage, rather than constant voltage
  • Check all vacuum lines, hoses, etc for any damage
  • Visually inspect the solenoid harness and the solenoid for damage
  • Replace EGR valve

Hope helps (remember comment and rated this).

Aug 05, 2010 | Eagle Talon Cars & Trucks

1 Answer

After sitting, hard to start, seems not to be getting fuel. you can spray starting fluid and it starts, must run at higher than normal idle for a few minutes, then will idle normally.


OPERATION The Idle Air Control (IAC) valve controls the engine idle speed and dashpot functions. The valve is located on the throttle body on. This valve allows air to bypass the throttle plate. The amount of air is determined by the Powertrain Control Module (PCM) and controlled by a duty cycle signal. Fig. 1: Cleanable IAC valve — 5.0L engine version shown, others similar 88484g22.gif
Fig. 2: Non-cleanable IAC valve — 5.0L engine version shown, others similar 88484g23.gif
prev.gif next.gif TESTING OBD-I System
  1. Make sure the ignition key is OFF.
  2. Disconnect the air control valve.
  3. Use an ohmmeter to measure the resistance between the terminals of the valve solenoid. NOTE: Due to the diode in the solenoid, place the ohmmeter positive lead on the VPWR pin and the negative lead on the ISC pin.
  4. If the resistance is not 7–13 ohms, replace the air control valve.
---
REMOVAL & INSTALLATION Fig. 1: Idle air control valve mounting — 4.9L engine version shown, others similar 88484g10.gif
  1. Disconnect the negative battery cable.
  2. Disconnect the engine wiring to the IAC sensor.
  3. Remove the two retaining screws for the valve.
  4. Remove the IAC valve and discard of the old gasket. Fig. 2: Disengage the idle air control solenoid electrical connection 88485p12.jpg
    Fig. 3: Loosen the idle control solenoid retaining screws 88484p08.jpg
    Fig. 4: Remove the idle air control solenoid from the throttle body 88484p09.jpg
    To install:
  5. Clean the area of old gasket material.
  6. Using a new gasket, attach the IAC valve to the engine. Tighten the retaining screws to 71–102 inch lbs. (8–12 Nm).
  7. Connect the IAC valve wiring to the unit.
  8. Connect the negative battery cable.
prev.gif next.gif

Aug 01, 2010 | 1990 Ford Econoline

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